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Rails 4 multiple image or file upload using carrierwave
...ploader Avatar
Create post scaffold
rails generate scaffold post title:string
Create post_attachment scaffold
rails generate scaffold post_attachment post_id:integer avatar:string
rake db:migrate
In post.rb
class Post < ActiveRecord::Base
has_many :post_attachments
accepts_nested...
How to handle multiple heterogeneous inputs with Logstash?
...? And then again, in the if statememt, if the tags were an array or single string, then both IF's would work. So logically this is incorrect, but maybe logstash has a different logic inside if's
– meso_2600
Oct 28 '18 at 18:06
...
Building a minimal plugin architecture in Python
...e too, although you can do a lot with just __import__, os.listdir and some string manipulation.
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Why do you need to invoke an anonymous function on the same line?
...ess function and groups it, but does not call it. The second line groups a string. Both do nothing. (Vincent's first example.)
(function (msg){alert(msg)});
('SO'); // nothing.
(foo);
(msg); //Still nothing.
But
(foo)
(msg); //works
...
Why is it OK to return a 'vector' from a function?
...oing to return a..." << std::endl;
return a;
}
int main(int argc, char** argv)
{
MyClass b = my_function();
MyClass c;
c = my_function();
return 0;
}
The output is the following:
run my_function()
run constructor MyClass::MyClass()
my_function is going to return a...
run constr...
How to free memory in Java?
...emory you may want to consider.
For example, say you'd declared a List<String> at the beginning of a method which grew in size to be very large, but was only required until half-way through the method. You could at this point set the List reference to null to allow the garbage collector to p...
How to get certain commit from GitHub project
...ng hash key 31af650ee25f65794b75d4dfefed6fe4758781c1, just get the first 7 chars 31af650. It's the default for GitHub.
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Where can I set environment variables that crontab will use?
...eriod is equivalent to the "source" command: tldp.org/LDP/abs/html/special-chars.html#DOTREF
– Jeff W
Mar 8 '13 at 21:55
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Generating random numbers in Objective-C
...
arc4random_stir(void);
void
arc4random_addrandom(unsigned char *dat, int datlen);
DESCRIPTION
The arc4random() function uses the key stream generator employed by the arc4 cipher, which uses 8*8 8
bit S-Boxes. The S-Boxes can be in about (2**1700) states. The arc4random(...
Design patterns or best practices for shell scripts [closed]
... values. This means that you have to invent a different strategy to return string values. My strategy is to use a variable called RESULT to store the result, and returning 0 if the function completed cleanly.
Also, you can raise exceptions if you are returning a value different from zero, and then ...